Hi

It seems inconsistent, org-sort numeric.
If org-sort numeric is applied to each of these one level headlines, the order is different in both (tested with emacs -q):


* Inconsistent org-sort. M-x org-sort numeric
** !Cuatro
** ~Cinco
** Tres
** 1
** 2

* Inconsistent org-sort. M-x org-sort numeric
** Tres
** !Cuatro
** ~Cinco
** 1
** 2